from tkinter import *

print('Введите начальную координату X:')
X = int(input())
print('Введите начальную координату Y:')
Y = int(input())
print('Введите коэффицент увеличения N:')
N = int(input())

coords = [0.0.10.10.20.10.20.0.20]

if N == 0 and X>=0 and X<=500 and Y<=500:
    pass
else:
    if N > 0 and 0*N+X>=0 and 0*N+X<=500 and 0*N+X<=500 and 20*N+Y<=500:
        pass
    else:
        if N < 0 and 20*N+X>=0 and 20*N+Y>=0 and 0*N+X<=500 and 0*N+Y<=500 
        pass
    else:
    print('Размер фигуры превышает максимальный размер поля')
    exit()
    
root = Tk()
root.title("ИТ марафон")
root.geometry("500x500")
    
canvas = Canvas(hg="white", width=500, height=500)
canvas.pack(anchor=CENTER, expand=1)

canvas.create_poligon(coords[0] *N+X? coord[1] *N+Y,
                     (coords[2] *N+X? coord[3] *N+Y,
                     (coords[4] *N+X? coord[5] *N+Y,
                     (coords[6] *N+X? coord[7] *N+Y,
                     (coords[8] *N+X? coord[9] *N+Y,
                     (coords[10] *N+X? coord[11] *N+Y)

root.mainloop()